STR-G6651
Data Sheet
OFF-LINE QUASI-RESONANT
FLYBACK SWITCHING REGULATOR
The STR-G6651 is specifically designed to satisfy the requirements
for increased integration and reliability in off-line quasi-resonant flyback
converters. This device incorporates the primary control and drive
circuit with a discrete avalanche-rated power MOSFET.
FDBK
OSC.
LATCH
UVLO
OVP
TSD
GROUND
OVERCURRENT
& FEEDBACK
SOURCE
SUPPLY
DRAIN
Cycle-by-cycle current limiting, under-voltage lockout with hyster-
esis, over-voltage protection, and thermal shutdown protects the power
supply during the normal overload and fault conditions. Over-voltage
protection and thermal shutdown are latched after a short delay. The
latch may be reset by cycling the input supply. Low-current startup and
a low-power standby mode selected from the secondary circuit completes
a comprehensive suite of features. The device is provided in a five-pin
over-molded TO-220 style package, affording dielectric isolation without
compromising thermal characteristics. Two lead forms are available
(with and without the suffix ‘-LF’) to accommodate printed wiring board
layout or mechanical constraints.
Proven in substantial volumes, the STR-G6651 is a robust low-risk
solution for off-line power supplies particularly where management of
EMI at the source is a significant element of the system design.
28102.9A
2
1
3
4
V
IN
OCP
Dwg. PK-011
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25
°
C
Control Supply Voltage, V
IN
. . . . . . .
35 V
Drain-Source Voltage, V
DS
. . . . . . . .
650 V
Drain Current, I
D
continuous . . . . . . . . . . . . . . . . . .
2.7 A
single-pulse, t
w
≤
1 ms . . . . . . . .
7.2 A
Avalanche Energy, E
AS
single-pulse . . . . . . . . . . . . . . .
158 mJ
Over-Current Protection Voltage Range,
V
OCP
. . . . . . . . . . . . . . .
-0.3 V to +6 V
Insulation RMS Voltage,
V
WM(RMS)
. . . . . . . . . . . . . . . . . .
2000 V
Package Power Dissipation, P
D
control (V
IN
x I
IN(ON)
) . . . . . . . . .
0.8 W
total . . . . . . . . . . . . . . . . . . .
See Graph
FET Channel Temperature, T
J
. . .
+150
°
C
Internal Frame Temperature, T
F
. .
+125
°
C
Operating Temperature Range,
T
A
. . . . . . . . . . . . . . .
-20
°
C to +125
°
C
Storage Temperature Range,
T
S
. . . . . . . . . . . . . . .
-40
°
C to +125
°
C
5
FEATURES
I
Quasi-Resonant Operation
I
Output Power to 66 W
I
Low-Loss, Pulse-Ratio-Control Standby Mode
I
Temperature-Compensated Pulse-by-Pulse Over-Current Protection
I
Latched Over-Voltage and Thermal Protection
I
Under-Voltage Lockout with Hysteresis
I
Active Low-Pass Filter for Enhanced Light-Load Stability
I
Switched Attenuation of Leading-Edge Current-Sensing Signal
I
Regulated Soft Gate Drive
I
Adjustable Switching Speed for EMI Control
I
Overmolded Five-Pin Package
Always order by complete part number:
STR-G6651
.
™
STR-G6651
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATOR
FUNCTIONAL BLOCK DIAGRAM
V IN
4
DRIVE
REG.
UVLO
OVER-VOLT.
PROTECT
S
REF.
R
FAULT
LATCH
Q
1
2
DRAIN
SOURCE
TSD
OSC
–
+
1.45 V
FEEDBACK &
OVER-CURRENT
PROTECTION
1.35 mA
–
+
0.73 V
5
3
GROUND
Dwg. FK-002-5
ALLOWABLE PACKAGE POWER DISSIPATION
30
MAXIMUM SAFE OPERATING AREA
50
ALLOWABLE PACKAGE POWER DISSIPATION in WATTS
27 W
MOUNTING SURFACE
TEMPERATURE
15
DRAIN CURRENT in AMPERES
20
5
LIMITED
BY
r
DS(on)
1.5
=0
.1
ms
SIN
t
w
=1
GL
ms
EP
SIN
UL
SE
GL
EP
UL
SE
LIMITED BY V
DS
max
t
w
LIMITED BY FRAME
TEMP. = +125°C MAX.
10
0.5
NO HEAT SINK
NATURAL COOLING
T
A
= +25°C
0.15
FREE AIR
CONTROLLER
1.5 W
0.8 W
0
20
60
100
TEMPERATURE in
°C
140
Dwg. GK-003-4
0.05
3.0
10
30
100
300
1000
Dwg. GK-004-5
DRAIN-SOURCE VOLTAGE in VOLTS
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1999, 2000 Allegro MicroSystems, Inc.
™
STR-G6651
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATOR
ELECTRICAL CHARACTERISTICS at T
A
= +25
°
C, V
IN
= 18 V, V
DD
= 10 V, V
S
= 0, voltage mea-
surements are referenced to ground terminal (unless otherwise specified).
Limits
Characteristic
On-State Voltage
Under-Voltage Lockout
Over-Voltage Threshold
Drain-Source Breakdown Voltage
Drain Leakage Current
On-State Resistance
Maximum OFF Time
Minimum Pulse Duration for Input of
Quasi-Resonant Signals
Minimum OFF Time
Feedback Threshold Voltage
Symbol
V
INT
V
INQ
V
OVP(th)
V
(BR)DSS
I
DSS
r
DS(on)
t
off
t
w(th)
t
off
V
FDBK
Test Conditions
Turn-on, increasing V
IN
Turn-off, decreasing V
IN
Turn-off, increasing V
IN
I
D
= 300
µA
V
DS
= 650 V
V
S
= 10 V, I
D
= 0.9 A, T
J
= +25°C
Drain waveform high
Drain waveform high
1
Drain waveform high
1
Drain waveform low to high
1
Oscillation synchronized
2
Over-Current Protection/Feedback
Sink Current
Latch Holding Current
Latch Release Voltage
Switching Time
Supply Current
I
OCP/FB
I
IN(OVP)
V
IN
t
f
I
IN(ON)
I
IN(OFF)
Insulation RMS Voltage
Thermal Shutdown
Thermal Resistance
V
WM(RMS)
T
J
R
θ
JM
Output junction-to-mounting frame
V
OCP/FB
= 1.0 V
V
IN
reduced from 24.5 V to 8.5 V
I
IN
≤
20
µA,
V
IN
reduced from 24.5 V
V
DD
= 200 V, I
D
= 0.9 A
Operating
3
Increasing V
IN
prior to oscillation
All terminals simultaneous refer-
ence metal plate against backside
Min.
14.4
9.0
20.5
650
–
–
45
–
–
0.68
1.3
1.2
–
6.6
–
–
–
2000
140
–
Typ.
16
10
22.5
–
–
–
–
–
–
0.73
1.45
1.35
–
–
–
–
–
–
–
–
Max.
17.6
11
24.5
–
300
3.95
55
1.0
1.5
0.78
1.6
1.5
400
8.4
250
30
100
–
–
1.63
Units
V
V
V
V
µA
Ω
µs
µs
µs
V
V
mA
mA
V
ns
mA
µA
V
°C
°C/W
Notes: Typical Data is for design information only.
1. Feedback is square wave, V
IM
= 2.2 V, t
h
= 1
µs,
t
l
= 35
µs
2. For quasi-resonant operation, the input signal must be longer than t
w(th)
and greater than V
FDBK
3. Feedback is square wave, V
IM
= 2.2 V, t
h
= 4
µs,
t
l
= 1
µs
www.allegromicro.com
STR-G6651
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATOR
ALLOWABLE AVALANCHE ENERGY
200
ALLOWABLE AVALANCHE ENERGY in mJ
150
SINGLE PULSE
DRAIN CURRENT = 1.8 A
100
50
0
0
20
40
80
120
60
100
STARTING CHANNEL TEMPERATURE in
°C
140
160
Dwg. GK-009-2
STR-G6600 Series
Drain-Source
Drain-Source
Output Breakdown Voltage ON Resistance
at I
D
= 300
µ
A
at I
D
= 0.9 A
V
(BR)DS
, Minimum
r
DS(on)
, Maximum
For 100/120 V AC Input
STR-G6622
STR-G6624
STR-G6632
STR-G6651
STR-G6652
STR-G6653
450 V
450 V
500 V
650 V
650 V
650 V
2.18
Ω
0.92
Ω
For 110/120 V AC Input
2.62
Ω
For 200/220 V AC Input
3.95
Ω
2.80
Ω
1.95
Ω
66 W
86 W
120 W
36 W – 50 W
44 W – 60 W
98 W – 130 W
Part Number
Output Power
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
™
STR-G6651
OFF-LINE
QUASI-RESONANT FLYBACK
SWITCHING REGULATOR
TYPICAL QUASI-RESONANT FLYBACK CONVERSION USING STR-G6651
WARNING:
lethal potentials are present. See text.
+ OUTPUT
4
DRIVE
REG.
UVLO
OVER-VOLT.
PROTECT
S
R
FAULT
LATCH
Q
1
2
VOLTAGE
SENSE
FULL-BRIDGE
RECTIFIER
REF.
AC INPUT
+
TSD
OSC
+
1.35 mA
– OUTPUT
–
+
1.45 V
–
+
0.73 V
5
3
#
Dwg. EK-003-4A
WARNING
—
These devices are designed to be operated at lethal voltages and energy levels. Circuit
designs that embody these components must conform with applicable safety requirements. Precau-
tions must be taken to prevent accidental contact with power-line potentials. Do not connect
grounded test equipment.
The use of an isolation transformer is recommended during circuit development and breadboarding.
Recommended mounting hardware torque:
4.34 - 5.79 lbf•ft (6 – 8 kg•cm or 0.588 – 0.784 Nm).
Recommended silicone grease:
Dow Corning SC102, Toshiba YG6260, Shin-Etsu G746., or equivalent
www.allegromicro.com
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